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Some time ago I’ve had to implement fencing on a Redhat cluster consisting of two cluster nodes, in an active-passive setup and two APC AP7921 power distribution units. While playing around with the fence_apc_snmp script as provided by Redhat, I’ve discovered a bug regarding the return status of an outlet after changing it’s state. I wrote a patch and submited a full bug report to Redhat regarding the issue.

Yesterday I’ve been informed that the patch has been accepted and got into version fence-1.32.68-5.el4. For more details you can have a look at Bugzilla #494587 .